${\mathrm{CaCO}}_3\stackrel{\mathrm{\Delta }}{⟶}\mathrm{A}+\mathrm{B} \left(\mathrm{g}\right)$

$\mathrm{A}+{\mathrm{H}}_2\mathrm{O}⟶\mathrm{C}$

$\mathrm{C}+\mathrm{B}⟶\underset{\left(\mathrm{white} \mathrm{precipitate}\right)}{\mathrm{D}}+{\mathrm{H}}_2\mathrm{O}$

$\mathrm{D}+\mathrm{B} \left(\mathrm{g}\right)\to \underset{\left(\mathrm{water} \mathrm{soluble}\right)}{\mathrm{E}}\underset{{\mathrm{BaCl}}_2}{\stackrel{\mathrm{Boil}}{\to }}\underset{(\mathrm{white} \mathrm{precipitate})}{\mathrm{F}}$

Note: Question details are changed from that of the book.

Select the correct option(s) for the white precipitate shown in the above reactions.